[BUG REPORT] Scourge of Darkness double dipping from eternal proc.

Expected:Scourge of Darkness should only get benefit from eternal weapon proc once.

Observed: Scourge of Darkness a Nightblade finisher getting benefit from eternal weapon proc twice, first benefit applied when Scourge of Darkness stacks gained as buff on player and second benefit applied when doing damage with it which is causin double dipping on ability.

Repro steps:
1) Cast Scourge of Darkness while having eternal weapon proc and damage target while still having proc and note down damage done.
2) Cast Scourge of Darkness while having eternal weapon proc and cancel eternal proc manually and damage target and note down damage done.
3) Cancel eternal proc and Cast Scourge of Darkness then wait for eternal proc and damage target and note down damage done.
4) Cancel eternal proc and Cast Scourge of Darkness then don't wait for eternal proc and damage target and note down damage done.
5) Compare damages done you will notice first version does double of step 2 and step 3 versions which are doing more damage than step 4 which is no eternal proc version.